[issue20356] fix formatting of positional-only parameters in inspect.Signature

[Roundup Robot]

Roundup Robot added the comment:

New changeset ffe1d684b41e by Yury Selivanov in branch 'default':
inspect.signature: Use '/' to separate positional-only parameters from
http://hg.python.org/cpython/rev/ffe1d684b41e

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nosy: +python-dev

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<http://bugs.python.org/issue20356>
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